I live on a small cul-de-sac, moved here just a few months ago. My neighbour from a few doors down is a childminder. My DS is friends with her DS, and my DS often also plays with her charges out on the cul-de-sac. I'm fairly friendly with her in general neighbourly terms. We sometimes chat and take each other's DS's to softplay etc, but we're not bff's or anything. We don't hang out together.
My DS has also become quite friendly with a particular child that stays with her sometimes. He's not one of her charges, he's one of her friends kid's, but he comes round occasionally for play dates/sleep overs with her DS. She sometimes allows this boy to come round to our house to play with my DS in DS's bedroom/garden.
He came round again to today and went upstairs to DS's room to play. 10 mins later neighbour is banging aggressively on my door. I let her in and she's shouting and swearing about how this boy hadn't told her he was coming round to play with my DS, that he'd left her back door wide open and "...I don't know what he thinks he's bloody playing at!" She storms upstairs to my DS's room and really lays into this kid. He's about 7 or 8 yrs old.
Now don't get me wrong, he most certainly should have told her if he was leaving the house and, while I thought she was ott with the shouting and swearing, I do understand her panic so tried to reserve my judgment. But what she said to him next had me a bit 
"You don't really know OP. Do you know that OP eats children, hmm?!! She does you know!!" she says, in all seriousness. Not even in a remotely joking manner. "She could've eaten you and I wouldn't even know!"
My DS giggles and says "my mum doesn't eat children" But she replies to my DS with "yes she does, why do you think you have no brothers or sisters? Cos she's eaten them all. You're the lucky one!"^
My DS is an only child.
I'm now flabbergasted and lost for words, but before I get a chance to step in she demands this boy downstairs and marches him off back to her house while she tells my DS to get his shoes on as he can play at hers instead. But my DS is clearly a bit disturbed by whats just happened and keeps nervously saying to her he doesn't want to go, so I tell her he needs a bit of space and show her the door.
DS then asks me "you don't eat children, do you mum?"
Of course I put him straight but I've had to spend the best part of 10 mins talking to him about emotions and panic and sometimes people say and do daft things in a panic. But I'm a bit narked if I'm honest that a childminder of all people was unable to control herself enough that she shouted, swore and frightened a young child with such a horrid story.
Now I'm not so sure I want my DS going round there any more. AIBU to tell DS not to go in her house again? Or am I being a bit precious and should just accept she just wasn't acting rationally in her panic?